To install:
1) Install original drivers (it's neccessary to install the same version as modded driver)
2) Put cards together you want to SLI
3) Reboot
4) Download the modded driver
5) Log in as Administrator
6) UAC must be disabled
7) run Install.cmd
8) reboot

I don't have nV cards so this mod doesnt help me personally, but I wanted to +1 the Russian Dude for doing this... I'm sure it helps - and is a fun mod - for many. This is why I originally found and came to TPU... (and was my first member sign-up to webforums actually)... to find a BIOS and hack a FireGLX3-256AGP card.

Yeah i tried switching them too.
I managed to activate SLi at least, but it's very unstable.
Like if i start any 3D-aplication such as games the screen turns black as he usually does while starting the game, but i then stays black.
the system and game is still working since i can hear the sound of the game but the screen will stay black until i manually crash the PC and reboot.

To install:
1) Install original drivers (it's neccessary to install the same version as modded driver)
2) Put cards together you want to SLI
3) Reboot
4) Download the modded driver
5) Log in as Administrator
6) UAC must be disabled
7) run Install.cmd
8) reboot

Click to expand...

i have tried this, im guessing it doesnt work with those cards or my board. going to find out soon with 570/580

I checked, your board doesn't support SLI, you need to use the other mod get it enabled....

Click to expand...

yea i know and im using the HyperSli Mod as well. i was just wondeirng if there was a certain step or something im missing.

install the mod first, then follow those steps correct?

edit-
got rid of the gigabyte p67a-ud3-b3 and received a dead(soon to be repaired) p67a Sabertooth and bought a new Asus P8Z77-V. So just waiting for the wifes 6950 to return from RMA and I will be trying the 580/570 even though its been confirmed to work already(need to try it for myself!)